Hi Ronny, > On 15/09/2022 14:32 ronny.lippold <ceph@xxxxxxxxx> wrote: > hi arthur, some time went ... > > i would like to know, if there are some news of your setup. > do you have replication active running? No, there was no change at CERN. I am switching jobs as well actually so I won't have much news for you on CERN infra in the future. I know other people from the Ceph team at CERN watch this ml so you might hear from them as well I guess. > we are using actually snapshot based and had last time a move of both > clusters. > after that, we had some damaged filesystems ind the kvm vms. > did you ever had such a problems in your tests. > > i think, there are not so many people, how are using ceph replication. > for me its hard to find the right way. > can a snapshot based ceph replication be crash consisten? i think no. I never noticed it myself, but yes it's written on the docs actually https://docs.ceph.com/en/quincy/rbd/rbd-snapshot/ (but on the mirroring docs this is not actually explained). I never tested that super carefully though and thought this was more a rare occurence than anything else. I heard a while back (maybe a year-ish ago) that there was some long term plan to automatically trigger an fsfreeze for librbd/qemu on a snapshot which would probably solve your issue (and also allow application level consistency via fsfreeze custom hooks). But this was apparently a tricky feature to add. I cc'ed Illya maybe he would know more about that or if something else could have caused your issue. Cheers, -- Arthur Outhenin-Chalandre _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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